This week from MIL:
"Infertility is nature's way of telling a couple they don't belong together."
She doesn't know DH and I have been TTC unsuccessfully for nearly three years. She said this about her friend's daughter who has endometriosis. Apparently if she met the right man, the endo would magically disappear 
Another gem from a friend who has switched to a gluten free diet:
"People struggling to conceive should give up gluten. They'd get pregnant then."
She doesn't know we're TTC either. Don't want to be pestered to give up the things I love!
What stupid things about fertility have you all heard?